Poweka LCD Car Voltmeter Thermometer Clock Voltage Volt Alarm Indoor Outdoor the car both inside and outside temperature sensing. Temperature measurement Meeting Wai as: -20-60 degrees. when the temperature is below -1 degrees, ice alarm warning lamp lights up. real-time monitoring of the car battery voltage, the figures show that when the voltage. the voltage of the state pattern instructions, the voltage is too high or too low, the alarm sound and lighting tips. blue, orange backlight color conversion.